Recently i had a thread showing i had a Hole in the Dalaran black market underbelly.
i recently learned that all my guildies and have it aswell and therefore i expect everybody to
now if you do it correctly you can mount up and fly under dalaran..
stand as I'm then strafe left a bit and go forward so you hit that wall,youll see all visuals removed and if you rotate camera to the right youl see your character standing on nothing .. but it does allow you to mount up
So take your flying mount mount up and hit space short cause goign to far up lands you back in underbelly.
then strafe a bit right and boom your good to go now you could use TomTom addon to get some locations cause you dont actually see them till inside..
Good luck exploring..
when flying up a bit Ass alliance BTW so should be teleported